Making an object disappear after a few seconds with Python (BGE)
Making an object disappear after a few seconds with Python (BGE)

Think event driven!
WHEN happens WHAT?
WHEN

after a few seconds

'After' is relative ... checking your details ...

appear when triggered, linger for a couple of seconds, and then disappear

So I guess you mean:
A few seconds after triggered
Solution
when you know the &quot;triggered&quot; event, you can start a timer, counter, whatever that triggers an event after the desired seconds.
Example: Timer Property
Property: &quot;time&quot;, type &quot;Timer&quot; (A timer property constantly increases it's value with each frame with the [configured] duration of the frame.)

When your trigger event happens you set the property to the number of seconds to wait and multiply it with -1 e.g. -3 for 3 seconds.

A property sensor can evaluate when the property &quot;time&quot; is greater than zero. That is the event you are looking for.

WHAT
whatever you want
Remarks

Timer properties are always float (avoid &quot;equal&quot; compare)
Lags will not be measured by timer properties
Timer properties always count upwards
Timer properties count always (it will not stop)
You can explicitly assign new values to timer properties (e.g. for reset)